Method of producing drill-jarring bars



. STUDNICKA METHOD OF PRODUCING DRILL JARRING BARS May 2, 1933.

Filed Jan. 22, 1932 3 Sheets-Sheet 2 May 2, 1933. A. J. STUDNICKA METHOD OF PRODUCING DRILL JARRING BARS Filed Jan. 22, 1932 3 Sheets-Sheet 3 Patented May 2, 1933 l ,907, l

UNITED STATES PATENT OFFICE.

ALBERT J. STUDNICKA, F MINNEAPOLIS, MINNESOTA METHOD OF PRODUCING DRILL-JARRING BARS Application filed January 22, 1932. Serial No. 588,220. g:

This invention relates to producing and and out of the most durable grade of cast manufacturing drill jar bars used in drilling steel. The preparation of the interlockin underground wells by which the drill must mould may be carried out by either methods penetrate through various substances of geof dry sand coring or of green sand mouldologic formations. The usual method of ing and I have illustrated and described drilling is to arrange the drilling tool at both procedures. the end of a cable in a tubular drive pipe My invention which is particularly pointor casting and by suitable operating meched out in the claim, will be more readily anism alternately raise and drop the drill understood by reference to the accompany- 10 bar with the drill a predetermined distance ing drawings forming a part of the specito dislodge or disintegrate the underground fication. 1 material. The drill bit then penetrates the In the drawings Fig. l is'a vertical secmaterial to a depth depending on the nation of a complete drilling bar produced acture of the formation in which it is workcording to my invention and showing it in 5 ing. To release the drill bit from the cavity a dropped position. Fig. 2 is a vertical seccontact thus formed, without excessive strain tion on the line 22 of Fig. 1, showing the on the operating cable, the drill bar carrying upper jar member in a raised position as the the drill usually is composed of two inter- Jar occurs in the raising of the drill. Fig. locking members having a relative sliding 3 is a horizontal cross section on the line 20 slip followed by an instantaneous jar which 3-3 of Fig. 2. 'Fig. 4 is a similar section on has the effect of dislodging the end of the the line of 4-4 of Fig. 2. drill bit from the cavity contact without In Figs. 5 to 11, I have illustrated the dry unduly straining the operating cable. core sand method of moulding. Fig. 5 is The drilling bar as a whole being thus a plan view of the core box showing one half subject to an incessant pounding must be of the pattern in position in the box. Fig. strongly constructed in the interlocking of 6 is a cross section on the line of 8-8 of the'two parts in order to hold together in Fig. 5. Fig.7 is a cross section 011 the line working position. It must furthermore have of 7-7 of Fig. 5. Fig. 8 is a longitudinal sufiicient weight for giving the necessary section on the line 6-6 of Fig. 5. Fig. 9 impact to the drill for disintegrating hard is a plan sectional view through the comrock formations, Heretofore the two mempleted dry sand core in position for castbers have been separately forged out of suiting and illustrating the method of interably carburized steel and subsequently rivlocking the casting of one bar section with eted or welded into the proper interlocked the other. Fig. 10 is a vertical section on sliding position. This procedure however the line l0-10 of Fig. 9 looking in the is expensive and furthermore results in he direction of the arrow. Fig. 11 is a vertical quent breakage and delay in the work, since section on the line 11l1 of Fig. 10. Fig. the rivets or welds are apt to give way from 12 1s apla'n View of a green sand mould the steady pounding and jar of the operaon the line of 1212 of Fig. 13, looking tion. upward and showing the method of casting The object of my invention is to produce the two bar members in interlocking position and manufacture a drilling bar as a whole in this form of mould. Figs. 13 to 16 in which the two members interlocked are are views illustrating the method of bringformed integral without welds, rivets, or ing the two sections into the sliding interbolts and in proper permanent slip and jar locking relation and form after they are position, by a simple inexpensive process of cast. manufacture. In the drawings A represents the lower The invention consists in novel methods drill carrying jar member and B the upper of moulding, casting and forming the two actuating member of the complete drill bar. 50 drill bar members in interlocked position The two members A and B are of identical construction and formation when cast, the lower member A being afterwards internally threaded to receive the drill pin 2 and the upper member turned down and externally threaded for connection to the cable box l. Thus a description of one member is equivalent to a description of the other and similar reference numerals are applied to the similar details shown in the drawings and described in the specification.

In the completed .form as illustrated in Figs. 1 to 4, the jar members A and B of the drilling bar are shown provided with a longitudinal perforate slot 6, bounded by parallel side sections 8 and terminating in one direction in a rounded abutment 10 and in the other direction ending in a tapered section 11 in the main body of the member. From the abutment 10 to their end the jar members are formed with the double opposed concave surface 12 as most clearly shown in Figs. 3 and 4. 'When in operating interlocked position asillustrated in Figs. 1 and 2, the inner convex face 13 of the parallel side sections 8 of one member, slideably fit the concave surface 12 of the other jar member. The release jar or jolt of the lower drill carrying jar member A occurs when the abutment 10 of the upper member Bstrikes the similar abutment 10 of the lower member A in the operation of drilling as indicated in Fig. 2.

Referring to Figs. 5 to 11, which illus trate the interlocking casting process of the jar members A and B by the dry sand or baked core method of manufacture, the number 1.6 indicates the core box in which may be moulded two identical half sections 18 of the complete core as indicated in Figs. 10, and 11. Each half of the core 18 is separated in the mould in two sections C and D by the thin stop plate 20 arranged centrally in the core box 16 as shown in Figs. 5, 7, and 8. The pattern 22 forms one half of a drill jar member mould and two identical moulds are made for a complete jar member, resulting in four sections which are afterwards glued together. The sand for the cores are mixed together with suitable binding material in the well known conventional manner for subsequent baking in ovens and the two end sections 00 and (Ir-cl are glued together when placed in flasks as will hereinafter be more specifically described.

5 It will be noted thatthe slot 6 in the pattern 22 is distended from the required parallel form in that the convex side sections 8 are spread some distances apart. This spread is a necessary feature of the interlocked casting process and is also necessary for the final positioning of the two bar members in sliding cooperating alignment, 8 which will hereinafter be explained. A core print 24L having a cross section identical with that of the side sections 8 of the bar members is arranged centrally and spaced from the side sections 8 of the pattern 22. One or two core prints 26 having an inner convex face corresponding to the convex form of the side sections 8 are spaced from the core print 24 the same distance as the space between the side sections 8 for reasons which will hereinafter be described. The stop plate 20 divides the core print 24; in two identical halves as shown in Fig. 5. Customary dowel pins 28, pouring holes 30 and gas vents 32 are provided in the core 00 and (l(l, and the procedure of removing the core box and pattern from the core are identical with common practice. The first one of the drill jar members for the complete drill bar may be moulded and cast in the ordinary way either in a dry sand core or green sand mould or it may be moulded in halves in a dry sand core box as above described and cast in any preferred manner. In casting the interlocking mate the origi nal completed casting is placed in an upright position in the ground or in a body of green sand with the sand topped square as indicated in Figs. 10 and 11. The assembled core sections 0-cand dd are then brought end to end on top of the supporting sand on theline of 10-40 of Fig. 9, the openings in the cores made by the core print- 24 and one of the core prints 26 straddling and fitting the side sections 8 of the upright standing casting. Glue having previously been applied to the abutting core ends, the two core members 0 and c are pressed together to form a unit the core of which, in the form of a jar member, is

open for the reception of the molten metal with the side sections 8 of both jar members in an interlocked position after the metal is cast and the core sand broken up.

In Figs. 12 and 13 illustrating the method of green sand moulding and casting one drill jar member interlocked with the other drill 'jar member, 84 is the loweror drag section of the moulding box. The pattern 36 (Fig. 12) is heredivided in four longitudinal sections by being split lengthwise at a degree angle. The casting 38 of one drill jar member which is cast in the ordinary way, is placed in an upright position in the drag moulding box and one longitudinal quarter of the pattern 36 is passed between the side sections 8 of the casting 38 in the open moulding box. The other longitudinal quarter of the pattern is then attached to the first half from the out side of the casting by means of suitable dowel pins 40, after which the sand is rammed around the pattern in the ordinary way and then the upper two quarters of the pattern put in place on the lower two quarters.

Thin smooth sheet metal bands 42 are then loosely wound around the side sections 8 of the standing casting in order 'to prevent sand being dragged loose in the cope from the rough castings. The top of the cope section 44 of the moulding box, is made of transverse boards 46, spaced apart to permit filling and ramming of the sand between the boards and to admit the passage through the cope of the casting 38. The cope sand is secured to the cope box in the ordinary way by wire nails, and the height of the cope section as: is adjusted so that the cope may be lifted a sufficient height to remove the patterns after moulding Without inter* ference by the upstanding casting with the sand in the cope between the side sections 8 of the casting as indicated by dotted lines in Fig. 13. After removal of the pattern from the mould the cope is replaced and casting is performed in the conventional manner. It will be seen that by both methods of moulding and casting as above apart corresponding to the described, the two jar members are suflicient so that ample space is left between the interlocking horizontal and vertical side sections 8 in the mould for a free run of the molten steel without explosive contact with cold steel. The length of the slots are so proportional that the two drill jar members after cooling and removal from the mould may be readily brought into position as illustrated in Figs. 14 and 15 to be turned around 90 degrees, relative to each other as illustrated by dotted lines in Fig. 15.

The finishing operation is to reheat the assembled drill jar members to bending temperature and by means of a bulldozer or other similar means straighten the side sections 8 to the parallel sliding position illustrated in Figs. 1 and 2. Various modifications may obviously be made in the proportions and construction of the parts used in the process of manufacture without departing from the scope of the invention and I do not therefore limit my claim to the actual construction shown and described.

Having now fully described my method of manufacture, what I claim as my invention is:

The method of making drill jarring bars having two sliding interlocked members, which consists in casting one of said members from a pattern having a longitudinal interlocking slot of greater than normal width, standing the cast member in an upright position in supporting sand, leveling the sand through the lower part of the vertical slot of said cast member, moulding two half sections for the second member to be cast, in a core box having a longitudinal split pattern arranged on its bottom plate and core prints projecting therefrom having the form of the cross section of the side walls of the longitudinal slots and spaced width of the slots tween the side Walls with a body of sand between the side walls thereof and a dividing plate separating the core sand centrally across the core prints, molding the core members thus separated and baking the moulded cores, placlng the dry core members on'top of the leveled sand and joining together the core sand members so that the cavities for the side walls of the bar member to be cast are placed one beof the slot of the cast member and the other outside thereof with a body of sand between said cavities and walls, securing and pouring in the mold the second member in a position at right angle to the cast first member, adjusting the castings to a parallel position and compressing the side Walls of the two members to an interlocked parallel sliding position.

In testimony whereof, I aflix my signature.

ALBERT J. STUDNICKA. 

